Adjustable muzzle brake



FIG. 1 is a perspective view from one side of the adjustable muzzlebrake, with a portiion of the attachable end shown;

FIG. 2 is an opposite side perspective view with a portion of the frontof the muzzle brake shown;

FIG. 3 is a front view of the adjustable muzzle brake;

FIG. 4 is a rear view of the attachable end of the muzzle brake; and,

FIG. 5 is a side view of the adjustable muzzle brake of FIG. 1.

The ornamental design for an adjustable muzzle brake, as shown anddescribed.